Show section numbers only if none of sections start with numbers

app/models/champs/header_section_champ.rb

@@ -22,6 +22,20 @@ class Champs::HeaderSectionChamp < Champ
     # The user cannot enter any information here so it doesn’t make much sense to search
   end
 
+  def libelle_with_section_index
+    if libelle_with_section_index? || siblings.any?(&:libelle_with_section_index?)
+      libelle
+    else
+      "#{section_index}. #{libelle}"
+    end
+  end
+
+  private
+
+  def libelle_with_section_index?
+    libelle =~ /^\d/
+  end
+
   def section_index
     siblings
       .filter { |c| c.type_champ == TypeDeChamp.type_champs.fetch(:header_section) }

app/views/shared/dossiers/editable_champs/_header_section.html.haml

@@ -1,5 +1,2 @@
 %h2.header-section
-  - libelle_starts_with_number = (champ.libelle =~ /^\d/)
+  = champ.libelle_with_section_index
-  - if !libelle_starts_with_number
-    = "#{champ.section_index}."
-  = champ.libelle